Battle of the Soyang River

The Battle of the Soyang River, also referred to as the "May Massacre", or Battle of Hyeon-ri (Korean: 현리 전투, Chinese: 縣里戰役) in Korean and Chinese was fought during the Korean War between United Nations Command (UN) and the Chinese People's Volunteer Army (PVA) and Korean People's Army (KPA) during the Spring Offensive of April–May 1951. The attack took place across the entire front but with the main thrust below the Soyang River in the Taebaek Mountains.

Source: Wikipedia — Battle of the Soyang River (CC BY-SA 4.0)